ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
To determine the partial structure associated with a particular element in a multicomponent system, contrast variation is proposed based on the use of modulated anomalous X-ray scattering (MAXS). The photon energy of the X-ray beam incident on the sample is modulated over a range of energies below an absorption edge of the selected element. Because of anomalous dispersion, measurement of the scattered-intensity gradient with respect to the energy gives the required information. MAXS can be used in both small-angle and wide-angle diffraction and is applicable, in principle, to crystalline, amorphous and liquid materials. Energy modulation obtained by oscillating the Bragg angle of the monochromator by a small amount, followed by phase-sensitive detection, leads to a significant reduction of both systematic and statistical errors. Results of a simulation study of MAXS from an aqueous solution of NiCl2 under extreme conditions of dilution and scattering contrast are presented.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0108767393002867
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